Why would God send unbelievers a strong delusion SO THAT all may be condemned who did not believe in the truth?

2 Thessalonians 2:9-12 (ESV) says: >"The coming of the lawless one is by the activity of satan with all power and false signs and wonders, and with all wicked deceptions for those who are perishing, because they refused to love the truth and so be saved. **Therefore God sends them a strong delusion, so that they may believe what is false, in order that all may be condemned who did not believe the truth but had pleasure in unrighteousness**." My question is: why would God want to send a strong delusion and why would he want people who do not believe to be led further astray? In my mind it doesn't make sense for it to be about simply being condemning the unbelieving because their unbelief already discredits them from heaven, why would they need to be led further astray? Does anybody know of any hypothesis as to why God would send such a strong delusion?